A systematic revision of the north-eastern Atlantic shallow-water Haplosclerida (Porifera, Demospongiae): 1. Introduction, Oceanapiidae and Petrosiidae
de Weerdt, W.H. (1985). A systematic revision of the north-eastern Atlantic shallow-water Haplosclerida (Porifera, Demospongiae): 1. Introduction, Oceanapiidae and Petrosiidae. Beaufortia 35(5): 61-91